US4799559A - Measuring apparatus - Google Patents

Measuring apparatus Download PDF

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Publication number
US4799559A
US4799559A US07/172,442 US17244288A US4799559A US 4799559 A US4799559 A US 4799559A US 17244288 A US17244288 A US 17244288A US 4799559 A US4799559 A US 4799559A
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US
United States
Prior art keywords
sensor
identification plate
readout device
measuring apparatus
integer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/172,442
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English (en)
Inventor
Herbert Murdter
Adolf Ast
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mettler Toledo Albstadt GmbH
Original Assignee
August Sauter KG
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Filing date
Publication date
Application filed by August Sauter KG filed Critical August Sauter KG
Assigned to AUGUST SAUTER GMBH reassignment AUGUST SAUTER GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AST, ADOLF, MURDER, HERBERT
Application granted granted Critical
Publication of US4799559A publication Critical patent/US4799559A/en
Assigned to METTLER - TOLEDO (ALBSTADT) GMBH reassignment METTLER - TOLEDO (ALBSTADT) GMBH CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). 2/14/90 GERMANY Assignors: AUGUST SANTER GMBH
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/01—Testing or calibrating of weighing apparatus
    • G01G23/017—Securing calibration against fraud
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/18—Indicating devices, e.g. for remote indication; Recording devices; Scales, e.g. graduated
    • G01G23/36—Indicating the weight by electrical means, e.g. using photoelectric cells

Definitions

  • the invention relates to a measuring apparatus, and more particularly a scale-type weighing apparatus wherein a sensor produces a digital value output signal which directly represents the measured quantity and its units of measure displayed on a visual display readout device disposed physically separate from the sensor and connected to the sensor by a signal line and which has an identification plate which serves as a display means for the technical measurement parameters of the sensor.
  • the identification plate with the technical measurement parameters be mounted in proximity to the display device which displays the measured quantities.
  • the parameters include data on the maximum load, the scale division on the display, the tare range, i.e., range of weights for which the scale can be set to subtract a tare, etc.
  • the particular identification plate be unambiguously associated with the given sensor. Accordingly, in known measuring apparatuses there cannot be provision for breaking the connection between the sensor and the readout device, which connection is supplied solely by the signal line.
  • An object of the invention is to devise a measuring apparatus, particularly a weighing apparatus, of the type described above wherein the sensor or the readout device may be replaced without the necessity to recalibrate the entire measuring apparatus.
  • the identification plate is releasably mounted on the readout device, and is inseparably connected to the sensor via a connecting member so that the readout device can be completely separated from the sensor without disturbance of the connection between the calibrated sensor and the identification plate which plate is the controlling factor as regards calibration, i.e., as regards any requirement to recalibrate.
  • the identification plate is disposed on the sensor itself. Hence it is readily disposed on the readout device which is in a location different from the location of the sensor.
  • the identification plate is disposed near the visual display device which displays the measured quantity.
  • the connecting member is formed by the signal line itself, which is inseparably connected to the sensor, and the identification plate is unremovably linked to the end of the signal line which is nearest the readout device
  • the signal line which must be present in any event, is used as the above-mentioned connecting member, thereby providing a very simple solution to overcome the above problems.
  • the signal line is passed through a bore in the identification plate, the diameter of which bore is greater than the outer diameter of the body of the signal line but less than that of the end of the signal line which is releasably coupled to the readout device.
  • This embodiment simplifies handling, because the identification plate is movable on the signal line and therefore is easy to remove from the readout device.
  • the fact that the end of the signal line is wider than the bore of the identification plate ensures that the identification plate will be held securely on the signal line and thereby will remain unremovably linked to the sensor.
  • the senor has a non-volatile memory for a characteristic integer, such as a number, which serves as a code word for the current parameter settings of the sensor; the sensor further has input means and circuitry for automatic shifting of the characteristic integer by a specified amount upon each subsequent setting of parameters, as well as means for storing this updated characteristic integer as a new code word in the non-volatile memory; and a character storage element, i.e., a fixed display device, provided with the current characteristic number is disposed on the identification plate and is secured there by a lead seal.
  • a characteristic integer such as a number
  • the character storage element is formed by a disc which is rotatably mounted on a surface region of the identification plate, which disc is provided in an azimuthal direction with a series of the possible characterizing numbers (integers), and a window is provided in the identification plate through which only the currently valid characterizing number is visible.
  • the rotational position of the disc with respect to the window is fixed by the lead seal.
  • the technical measurement parameters of the sensor are disposed on a second character storage element which is also secured to the identification plate by the lead seal.
  • the character storage element may be replaced readily by a new character storage element which bears the new technical measurement parameters underlying the new calibration.
  • a new lead seal would have to be applied in any event when the recalibration is carried out; under this novel concept, the new seal also ensures that the character storage element itself cannot be changed, i.e., neither character storage element can be changed, without detection.
  • the character storage element for the technical measurement parameters of the sensor is disposed between the readout device and the identification plate, with the identification plate being form-interlockingly mounted on and against the readout device, and the plate is transparent in the region of the second character storage element.
  • the character storage element is compressively held between the identification plate and the abutting surface of the readout device, against which surface the identification plate, and thus the character storage element, is form-interlockingly held.
  • the character storage element is visible through and protected by the transparent region of the identification plate.
  • the invention also includes the concept of providing the identification plate with an electrical keypad device for entering the current characterizing integers of the character storage element and providing the readout device with a comparator for the number keyed in on the keypad and the number stored in the sensor, whereby the sensor is rendered inoperative, or locked, if the numbers do not match. Thereby, if the last official calibration is no longer valid, the measuring apparatus is automatically blocked.
  • the readout device may be provided with a visual display device for the characterizing integer stored in the sensor.
  • a visual display device for the characterizing integer stored in the sensor.
  • the identification plate may have snap-in projections whereby it is releasably affixed to corresponding configurations on the readout device.
  • the identification plate may have a magnetic arrangement which holds it firmly to the readout device. In both cases, the identification plate may then be released by simply pulling it off of the readout device by hand, so that after the coupling between the signal line and the readout device is released the readout device may be handled completely separately from the sensor. Thus in the event of failure of the readout device the readout device may be readily replaced without disturbing the calibration which is still valid for the sensor. Similarly, the sensor may be replaced by another, already calibrated sensor.
  • FIG. 1a is a schematic perspective overall view of a weighing apparatus comprised of a readout device, a weighing bridge, a connecting signal line, and an identification plate;
  • FIG. 1b is a perspective view of a character storage element for the identification plate.
  • FIG. 2 is a front elevational view of the readout device.
  • a sensor 1 is provided in a weighing bridge (not shown), whereby the weight of a load placed on the weighing bridge is determined and is converted into a corresponding measurement quantity.
  • the sensor 1 is designed such that its output signal comprises a digital value which represents the measured quantity, namely the weight, directly in its unit of measure.
  • the output signal does not require any further processing in the nature of valuation, but can be displayed directly on the display device to represent the weight.
  • a signal line 2 is inseparably connected to the sensor 1.
  • the signal line 2 carries the output signal of the sensor 1 to the readout device 3 which is at a different location from the sensor.
  • a visual display device 4 in the readout device 3 visually displays the weight and its units of measure.
  • the signal line 2 which is the sole connecting member between the sensor 1 and the readout device 3 is inseparably connected to the sensor 1 on its (the signal line's) end disposed toward the sensor, the other end of the signal line, directed toward the readout device 3, forms one member 5 of a plug coupling which plugs into a complementary coupling member 6 on the readout device 3.
  • the coupling formed by members 5 and 6 thus provides a releasable connection between the readout device 3 and the weighing bridge 1; the connection is shown released in FIG. 1a.
  • An angle-shaped identification plate 7 has a cross-sectional profile which matches that of a region of the rear side 8 of the readout device 3, which region bears the complementary coupling member 6.
  • One leg 9 of the identification plate extends over a region of the front side 10 of readout device 3, which region is near the visual display 4.
  • the other leg 11 extends from the corner 120 over the rear side 8 and beyond the coupling member 6.
  • the free end region 12 of leg 11 is provided with a bore 13 having a signal line 2 which passes through it, and slightly smaller than the end coupling member 5 of the signal line 2. In this way, the identification plate 7 is reliably held on the signal line 2 and is unremovably connected to the sensor 1 of the weighing bridge.
  • the identification plate 7 When the coupling 5, 6 is coupled, the identification plate 7 is form-interlockingly mounted on the readout device 3 by means of the snap-connector strip, or edge, 14 disposed on the free end of leg 9, which strip 14 engages a corresponding cooperative slot 15 on the readout device 3.
  • the snap connection 14, 15 To separate the weighing bridge containing sensor 1 and the identification plate 7 from the readout device 3, as shown in FIG. 1a, one releases the snap connection 14, 15 to remove plate 7 and separates the coupling members 5 and 6.
  • the sensor 1 provided in the weighing bridge is further designed such that control signals sent over the signal line 2 can be used to reset the parameters of the sensor, e.g., to change the sensitivity or units of measure, or to trigger a self-recalibration.
  • the readout device 3 is provided with a keypad 16 for entering the corresponding control commands.
  • the sensor 1 has a non-volatile memory wherein a characteristic integer is stored which represents a code word for the currently valid calibration of the sensor. This memory may be comprised of, e.g., an EAROM.
  • a logic device also provided in the sensor 1, is actuated in response to each command for resetting of parameters, or recalibration, whereby the characteristic integer is shifted by a specified quantity, and the thus updated characteristic integer is stored as the new code word, in the non-volatile memory.
  • the characteristic integer forming the new code word may be displayed permanently, or may be displayed when queried by a specified key on the keypad 16 on the readout device 3.
  • the display may be via, e.g., the visual display device 4.
  • a disc 17 is rotatably mounted on the leg 11 of the identification plate 7, which leg 11 extends along the rear side 8 of the readout device 3 when the system is in the coupled state.
  • a sequence of characterizing integers such as numbers, is permanently impressed, which integers correspond to the sequence of possible characterizing integers of the sensor. These integers are spaced at equal angular distances.
  • the disc 17 thus forms a character storage element.
  • the leg 11 of the identification plate 7 has a window 19 at a radial distance from pivot 18 which distance corresponds to the radial location of the circle of characterizing integers.
  • the integers are disposed against the inner side of the angular identification plate 7, which inner side faces the readout device 3.
  • Disc 17 has bores (not shown) in it which may be arrayed in a circle and are spaced at the same angular interval as the characterizing integers. For each such integer a bore in disc 17 aligns with a bore 20 in leg 11 when the integer lies under the window 19. The diameters of these bores allow a wire of a lead seal 21 to be passed through both of them at once, thereby providing lead seal means to lock the disc 17 in a given rotational position with respect to the window 19. After a calibration has been completed, the characterizing integer visible through window 19 is set to correspond to the characterizing integer stored in the non-volatile memory of the sensor 1.
  • the characterizing integer in the memory of the sensor will be changed, so that said integer will differ from the integer fixed in the window 19; thereby indication is given that a recalibration is required.
  • the disc 17 will be reset accordingly, and will be resealed in place with a new lead seal.
  • a second character storage element 22 is provided (FIG. 1b which has an L-shaped cross section.
  • Leg 23 of element 22 bears the appropriate technical measurement parameters and extends along the inner surface of leg 9 of the identification plate 7 which latter leg normally rests against the readout device 3.
  • the other leg 24 of element 22 extends along the inner surface of leg 11 of identification plate 7, which latter leg has the bore 20 therein.
  • Leg 24 has a bore 25 which aligns with and matches the bore 20 of plate 7 and which is also penetrated by the wire of lead seal 21, whereby the character storage element 22 is also secured to plate 7 by seal 21, and thereby is held in fixed relationship with sensor 1 of the weighing bridge.
  • the leg 24 may have a second opening 26 in the region of the pivot 18.
  • Leg 9 of the identification plate 7 is transparent, so that when it is clipped onto the readout device 3 as shown in FIG. 2 the technical measurement parameters borne on leg 23 of the character storage element 22, which is held fixed between the readout device and the inner side of leg 9 of identification plate 7, are visible through plate 7.
  • one may provide, e.g., a magnetic device whereby the identification plate 7 is held on the readout device 3 by magnetic force.
  • the identification plate 7 may further have an electrical keypad device (not shown) for entering the current characterizing integer to be established in the window 19.
  • an electrical keypad device for entering the current characterizing integer to be established in the window 19.
  • disc 17 bears a sequence of integers 1-16 in a circular array
  • the representation of the numbers can be furnished by four concentric paths on disc 17, which paths are assembled from alternatively electrically conducting and nonconducting layers, according to a prescribed coding. These paths are electrically sensed by a sliding contact, or brush for example, whereby for each characterizing integer to be fixed in window 19 a unique 4-bit code is sensed.
  • the sensed signal is compared with a characterizing integer stored in the sensor 1; a comparator (not shown) provided in the readout device 3 is used for this comparison. If the two integers do not agree, the output of the measured quantity by the readout device 3 is blocked by the output of the comparator.
  • the coupling 5, 6 can be released and the identification plate 7 can be removed from the readout device 3, whereby a different readout device can be connected to coupling member 5.
  • the identification plate 7 which is unremovably connected to the sensor 1 is affixed to the new readout device, and bears the validation of the calibration of the sensor.
  • a new, already calibrated sensor 1 provided with a new signal line 2, an identification plate 7, and a characterizing integer set on the plate 7 and locked with a lead seal, may be readily connected to the readout device 3. Accordingly, the entire weighing apparatus remains ready to operate, without the necessity of recalibrating the entire apparatus.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Measurement Of Radiation (AREA)
  • Pens And Brushes (AREA)
US07/172,442 1987-03-25 1988-03-24 Measuring apparatus Expired - Lifetime US4799559A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3709717 1987-03-25
DE3709717A DE3709717C2 (de) 1987-03-25 1987-03-25 Meßgerät, insbesondere Waage

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US4799559A true US4799559A (en) 1989-01-24

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US07/172,442 Expired - Lifetime US4799559A (en) 1987-03-25 1988-03-24 Measuring apparatus

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US (1) US4799559A (fr)
EP (1) EP0283704B1 (fr)
JP (2) JPS63266317A (fr)
DE (1) DE3709717C2 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5841077A (en) * 1995-12-01 1998-11-24 Kolaci; Rudolph J. Digital load cell assembly
WO2001092837A1 (fr) * 2000-05-31 2001-12-06 Vaghi Family Intellectual Properties, Llc Peson electronique amovible se fixant a de l'equipement de bureau
US6464415B1 (en) 2000-09-20 2002-10-15 Vaghi Family Intellectual Properties, Llc Personal computer having a built-in printer, and a system and method for computing rate information using the computer
US6509532B1 (en) * 1999-05-03 2003-01-21 Vaghi Family Intellectual Properties Electronic scale
US20060206283A1 (en) * 2003-12-11 2006-09-14 Sartorius Ag Measuring device with evaluation unit and external memory
US20090205876A1 (en) * 2008-02-19 2009-08-20 Rubbermaid Incorporated Digital Scale with Magnetic Engagement of a User Interface Unit
US20090293580A1 (en) * 2006-04-28 2009-12-03 Wolfgang Babel Method for Calibrating and/or Adjusting a sensor, especially an electrochemical, electrophysical or optical sensor, and corresponding sensor
US20120031683A1 (en) * 2010-08-05 2012-02-09 Mettler-Toledo (Albstadt) Gmbh Weighing scale having regulatory compliance components
US20130247300A1 (en) * 2012-03-21 2013-09-26 Midmark Corporation Medical Examination Table With Integrated Scale
US9255859B2 (en) 2010-11-15 2016-02-09 Advanced Mechanical Technology, Inc. Force platform system
US10830633B2 (en) * 2017-03-02 2020-11-10 Bizerba SE & Co. KG Load cell for a scale with a switching device for changing the state of calibration data write protection
US11262716B2 (en) * 2017-07-04 2022-03-01 Sick Ag Method for the parameterization of a sensor

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4445526C2 (de) * 1994-02-04 2003-05-28 Sartorius Gmbh Anlage zur Meßwerterfassung und Anzeige, insbesondere Wägeanlage
FR2718525B1 (fr) * 1994-04-08 1996-06-28 Antoine Klotz Système de sécurité associé à un appareil nécessitant une intervention suivant un calendrier prédéterminé.
DE19747323C2 (de) * 1997-10-27 2001-02-08 Bizerba Gmbh & Co Kg Elektronische Waage mit eichtechnischer Sicherungseinrichtung
JP4523686B2 (ja) * 1999-11-09 2010-08-11 株式会社エー・アンド・デイ 電子部と機構部とが各々独立している電子秤
WO2017001250A1 (fr) * 2015-06-30 2017-01-05 Koninklijke Philips N.V. Un système de capteur et un procédé qui utilise de multiples capteurs de ppg

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US4423486A (en) * 1981-04-30 1983-12-27 Hobart Corporation Commodity display for weighing scale
US4506330A (en) * 1982-07-06 1985-03-19 Pitney Bowes Inc. Electronic mailing apparatus and method
US4586575A (en) * 1984-02-29 1986-05-06 August Sauter Gmbh Measuring apparatus with automatic operating mode-setting
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US4601355A (en) * 1983-08-31 1986-07-22 Kabushiki Kaisha Ishida Koki Seisakusho Electronic weigher

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DE2904261C2 (de) * 1979-02-05 1989-01-12 Maatschappij van Berkel's, Patent N.V., Rotterdam Elektronische Waage, insb. Ladenwaage
DE2922875A1 (de) * 1979-06-06 1980-12-18 Sartorius Gmbh Elektrische waage mit programmgesteuertem mikroprozessor
JPS56125631A (en) * 1980-03-06 1981-10-02 Kubota Ltd Span adjusting method
DE3129408A1 (de) * 1981-07-25 1983-03-03 DSG Schrumpfschlauch GmbH, 5309 Meckenheim Kennzeichentraeger aus kunststoff zum kennzeichnen von gegenstaenden, wie geraete, kabel, leitungen, rohre, schlaeuche oder dergleichen
CH656463A5 (en) * 1982-09-30 1986-06-30 Mettler Instrumente Ag Balance
CH659890A5 (de) * 1983-01-29 1987-02-27 Mettler Instrumente Ag Messgeraet mit einem durch einlesen einer vorgegebenen elektrischen impulsfolge programmierbaren nichtfluechtigen schreib-/lesespeicher.
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Publication number Priority date Publication date Assignee Title
US4377214A (en) * 1981-02-10 1983-03-22 Pitney Bowes, Inc. Method and apparatus for interfacing an electronic scale system with a storage medium
US4423486A (en) * 1981-04-30 1983-12-27 Hobart Corporation Commodity display for weighing scale
US4506330A (en) * 1982-07-06 1985-03-19 Pitney Bowes Inc. Electronic mailing apparatus and method
US4597457A (en) * 1982-08-19 1986-07-01 Kabushiki Kaisha Ishida Koki Seisakusho Electronic scale with CRT display
US4601355A (en) * 1983-08-31 1986-07-22 Kabushiki Kaisha Ishida Koki Seisakusho Electronic weigher
US4586575A (en) * 1984-02-29 1986-05-06 August Sauter Gmbh Measuring apparatus with automatic operating mode-setting

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5841077A (en) * 1995-12-01 1998-11-24 Kolaci; Rudolph J. Digital load cell assembly
US6509532B1 (en) * 1999-05-03 2003-01-21 Vaghi Family Intellectual Properties Electronic scale
WO2001092837A1 (fr) * 2000-05-31 2001-12-06 Vaghi Family Intellectual Properties, Llc Peson electronique amovible se fixant a de l'equipement de bureau
US6376783B1 (en) * 2000-05-31 2002-04-23 Vaghi Family Intellectual Properties, Llc Removable electronic scale cartridge, and a system and method which uses the scale cartridge to compute postal/carrier rates
US6464415B1 (en) 2000-09-20 2002-10-15 Vaghi Family Intellectual Properties, Llc Personal computer having a built-in printer, and a system and method for computing rate information using the computer
US7623980B2 (en) 2003-12-11 2009-11-24 Sartorius Measuring device with evaluation unit and external memory
US20060206283A1 (en) * 2003-12-11 2006-09-14 Sartorius Ag Measuring device with evaluation unit and external memory
CN101432597B (zh) * 2006-04-28 2015-11-25 恩德莱斯和豪瑟尔测量及调节技术分析仪表两合公司 用于标定和/或调整传感器特别是电化学、电物理或光学传感器的方法，以及相应的传感器
US20090293580A1 (en) * 2006-04-28 2009-12-03 Wolfgang Babel Method for Calibrating and/or Adjusting a sensor, especially an electrochemical, electrophysical or optical sensor, and corresponding sensor
US8733148B2 (en) 2006-04-28 2014-05-27 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG Method for calibrating and/or adjusting a sensor, especially an electrochemical, electrophysical or optical sensor, and corresponding sensor
US20090205875A1 (en) * 2008-02-19 2009-08-20 Rubbermaid Incorporated Portable Digital Scale
US20090205876A1 (en) * 2008-02-19 2009-08-20 Rubbermaid Incorporated Digital Scale with Magnetic Engagement of a User Interface Unit
US20120031683A1 (en) * 2010-08-05 2012-02-09 Mettler-Toledo (Albstadt) Gmbh Weighing scale having regulatory compliance components
US8664546B2 (en) * 2010-08-05 2014-03-04 Mettler-Toledo (Albstadt) Gmbh Weighing scale having regulatory compliance components
US9885623B2 (en) 2010-11-15 2018-02-06 Advanced Mechanical Technology, Inc. Method and system for simultaneously starting actions of devices
US10704973B2 (en) 2010-11-15 2020-07-07 Advanced Mechanical Technology, Inc. Data acquisition device and method of timing data sampling
US9255859B2 (en) 2010-11-15 2016-02-09 Advanced Mechanical Technology, Inc. Force platform system
US20130247300A1 (en) * 2012-03-21 2013-09-26 Midmark Corporation Medical Examination Table With Integrated Scale
US10071009B2 (en) 2012-03-21 2018-09-11 Midmark Corporation Medical examination table with integrated scale
US8978181B2 (en) * 2012-03-21 2015-03-17 Midmark Corporation Medical examination table with integrated scale
US10830633B2 (en) * 2017-03-02 2020-11-10 Bizerba SE & Co. KG Load cell for a scale with a switching device for changing the state of calibration data write protection
US11262716B2 (en) * 2017-07-04 2022-03-01 Sick Ag Method for the parameterization of a sensor

Also Published As

Publication number Publication date
DE3709717A1 (de) 1988-10-06
EP0283704A2 (fr) 1988-09-28
EP0283704B1 (fr) 1991-09-18
DE3709717C2 (de) 1997-05-15
JPS63266317A (ja) 1988-11-02
JPH0743684U (ja) 1995-09-05
EP0283704A3 (en) 1989-08-09

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